Demographics, smoking history, quitting history, and current (past month) smoking rate will be measured with brief, face-valid questionnaires. The investigators have used in previous studies a 10-item measure of current smoking rate, years of smoking, and length of longest and most recent attempts to quit smoking. This measure is similar to, but a bit more detailed than, the Active Smoking Questionnaire downloadable from the NCI website. It will be adapted for this study to assess e-cigarette use, which is rapidly increasing, with at least one-third of US adult smokers having ever used e-cigarettes.